Computer Graphics                                                     chapter 1
   Computer Graphics                                                     chapter 1
   Computer graphics:
  Graphics are created using computers and the representation of 
   image data by a computer specifically with help from specialized 
   graphic hardware and software.
  The term computer graphics involves using a computer to create 
   and hold pictorial information and also to adept and manipulate 
   the display in different ways.
  A computer is capable of sending its output to wide variety of 
   devices,  many of which are designed for special purposes. We 
   will  concern  ourselves  with  devices  that  capable  of  producing 
   graphical output on the computer's display.
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       Computer Graphics                                                     chapter 1
       Computer Graphics                                                     chapter 1
     Applications of computer graphics
     Entertainment جومواربلوولين  فلووا ميمصتلووا)وهيوفرتو ةيلسووت لل
          مللووفواو ةيوزافلتلووا                              
     هيفرتلاو ةيلستلا لجأ نم اتلسلسملاو                                                         
                                                                                                                  
     Computer-aided design                ميمصتلوو ا
         بوساحلووا ةنواوعموووب
     Presentation Graphics يمويدقتلووايم  وقرلووا موسرلووانو  وف          
                                                
     Training and Education ب(ويوردتلوواو ميلعتوولا )                    
                                
     E-commerce                                                
           ةيونورتلوكلوا ةراجتلووا
                                                                                                           2
           Computer art                                          
         بوساحلووا ةطوسواوووبن  فلووا
   Computer Graphics                                                     chapter 1
   Computer Graphics                                                     chapter 1
  The origins of computer graphics:   In 1950 the first computer driven display, 
    attached to MIT's computer, was used to generate simple pictures. This 
    display used a Cathode-Ray tube (CRT). Interactive computer graphics 
    made progress and the term computer graphics was first used in 1960.
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   Computer Graphics                                                     chapter 1
   Computer Graphics                                                     chapter 1
  Interactive Computer Graphics
  It involves two way communications between computer 
  and user. The computer up on receiving signals from 
  the  input  device  can  modify  the  displayed  picture 
  appropriately.
  The main reason for the effectiveness of interactive 
    computer graphics in many applications is the speed 
    with which the user of the computer can assimilate 
    the display information.
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   Computer Graphics                                                     chapter 1
   Computer Graphics                                                     chapter 1
  Cartesian coordinate system
  A coordinate system provides a framework for translating geometric ideas 
  into numerical expressions.
   In a two-dimensional  plane,  we  pick  any  point  and  single  it  out  as  a 
   reference  point  called  the  origin.  Through  the  origin  we  construct  two 
   perpendicular number lines called axes. These are labeled the X axis and 
   the Y axis. 
   Any point in two dimensions in this X-Y plane can be specified by a pair of 
   numbers, the first number is for the X axis, and the second number is for 
   the Y axis.
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